[1] Thorslund won the vacant WBO female super-bantamweight title, defeating Mexican Jessica Arreguín by unanimous decision on 25 August 2018 at the Struer Arena.
[2] After making three successful defences of her title, Thorslund switched weight divisions to claim the vacant WBO female World bantamweight crown with a unanimous decision win over Jasseth Noriega on 25 June 2021.
[4][5] She defended all three belts for the first time on 24 February 2024, when she secured an eighth-round stoppage win against Spain's Mary Romero who had accepted the fight on two days' notice.
[6] Thorslund had originally been scheduled to face Turkish boxer Seren Cetin but the challenger was ruled unfit to fight due to a fresh cut by her left eye that had been closed by six stitches.
[8] She defended her titles again on 25 October 2024, securing a unanimous decision win over Terumi Nuki at Graakjaer Arena, Holstebro, Denmark, with all three judges awarding her the fight 99-91.